Shock-absorber.



D. F, KILGOUR.

SHOCK ABSDRBER.

APPLICATION FILED JUNE 2, 1911.

Patented Feb. 8, 1916 1ra/vena?.- f/glzzlvm Q if in 'rinfrmo sirafrasPATENT OFFICE 13"171'153-1'12 i. KLGOU'R, (2F LEXNGTON, MASSACHUSETTS,ASSIGNOR TO KNOJAH SHOCK BSO'RBER COMPANY, 0F LEXINGTON', MASSACHUSETTS,A CORPORATION OF MAS- SHOCK-ABSORBER 1,1 roars.

Application led .Tune 2. 1911.

111 1/11, '1r/mm it 11111)/ cori/fwn Be it. lniown that; l. Dwmnr F.Kinooia, a citizen ot' thel United States. and a resident of latxington.in the county of Middlesex and tonnnonwe 1th oi" Massachusetts. havenventeai an liny'nforernent in Shoclvbsorbf ers@ of which the following`description. in corni-ction with the accompanying drawings. ,Y a.speciiication1 like characters on the drawings reprefiontii'igr likeparts.

This invention relater: to shock absorbers and a modification of theinvention disY closed in mi' lfnitwl States Letters latent "1o.(181.21177 dated Fein-namy 111, 1911,

'the 1-ha1':|cter ot thil invention mayY 11e best nnfierstood byreference to thc following?t description of an illnstratiw cmbofli11111115: 111.111'111' shown in the accom]lanying: 1ir.1.\ii`|rf.wherein:

iiignrw l is a \i=11\ 11i a portion of 11 vehicle clplippcfl n ith ashoci.' absorber embodying tnuinvcntioii: Vig. 2 on an '*nlarged scale i11 n'oi'icfil scction through 1h11- shock abraorhcr shown in Fig. lisolated from the which: l `i; f. is a, transvcrsc section taken ofVijf. and 151g. -l isa detail on lii 1A "1 an 11h-mont ol' the shockabsorber to be 1111111111 to.

1411111111113' io the drawing. thc illustrative 11111111111111-111, ol'1h(y inrcntion thcrc shown 1-1'1. 1113112# a (using l. hcrcin of sectorforni 1111 1111111111111 with c,o\'cr platt-,s il and 5 y-11c11 ina;v bccon'1'cnicntl1' sccnrcfl to said 1 1 ing 11j.' bons voti-ring; thronghrcglilstcrinnr 111111111v in raid plates-:11111casing. 'lo di 151y *1.11ning ihns` totnicd into two chain` thcrc ic prmidcil an arc likepartition of wali l nilawcfl to bc slid into frooros li i'n t.1.1, i1losof said casing. said pariition |11at1l lain; retaincd in place by the1-11'111 platt-.s on thcoppositosidcss111111 casing. 'l`hc partition maybo readily r1- nnnc'i t'or rcplaccrncnt incl'cly by' removing 11111 otsaid .'1\cr piatcs. Within thc 1ai':.!cr chambcr is a plnngcr. hcrcin inth(l t'orm ot. fwciltatolfr 111:1111l 111 projccting 111111111111y from:1 shalt lf conwnicnlly intcgral with .said 111111111111111inningfatud1T -=catcd ina simi Specification of Letters Patent.

Patented Feb. 8, 1916.

Serial No. 630,747.

bon is provided with suitable packing materlal Q5 and a gland 27 held inlace b a 1:11p 251 threaded exteriorly on sind stu ng box. The portionof the casing receiving said shaft preferably is curved to'conform tothe contour of said shaft.. The latter projects beyond said stalling boxand is reduced and squared olf at 31 to receive an actuating arm $13pinned or otherwise secured thereto. The free nd Of Said arm has auniversal connection with one end of a link! 35. the opposite end ofwhich has a. similar universal connection with a lug 37 on a .strap ladapted to be bolted to a similar strap I1 V`nid straps being formed toeinbractl the :1Mo of the vehicle. The unircrsal connections referred toherein are in the form of pairs ot' interlinked staple-likc members ilwhich will readily permit npandwlown as well as lateral movements of thcvehicle chassis or body. One ot' cach pair of said intcrlinkcd staplesi" adjnstably hcld in place by set nots 45 thereby proriding aconvenient; means for taking 11p wcar and preventing rattling.

To nciinit th1l casing to bc secured to thc chasfns of a vehicle or atother place ot' use, its rnd.u are cxtcnded to provide cars -17 haringbolt rcrciring holes 4f). A\shown hcrcin. thc casing is secured to thcchassis ot the rchicle and thc link 33 is connected to the axle ot' thcwhich` bnt il will bc apparent that their positions might |11-rcrcrszcd. it' dcsircd. 'The casin,r is ol' littlc thickncss and n|a \Ybe readily sccnrcd in an incom; icnons position :1nd in sonic instanceswithin the channel ol' thc chassis trame.

ln the course of the travel of higrclliclel rclatiw niorclncntslb1-twccn tic which', body and its 11x11- will canse thc casing to \lrat1 11p and down with .said bod)Y and cl'- i'cct rclatirc nlowlncntbctwccn said casing.r and said rockingf blade. tlnl t'rcc clnl oll thc,iattcr during.r this4 morcnlcnt., wiping along tho cnrrcd t'acc of thcpartition plate relcrrcd to,

rl`|11 chainbcrs will contain and prclcrably |1c 11111111 with aysnitablc rctar1lin, r Ilnid or oil which may bcintro11||cc1lthcrcinthrough an inici loci .'11 normally closcd b v a |i111..1'1-1lpingA 5i?. '1`o pcrlnit thc lliid or il 111 pass or circnlatc l'roln oncot' said chambcrs to 1111111.11111'. .said partition plato ina)v bc pcit'oi'aicd analop'onsli' or similarly to the arran ement of perforationsShown in my Letters atent referred to. The perforations in saidpartition are arranged t0 permit the fluid to pass freely therethroughwhile the piston blade moves centrally of said plate, but offers greaterresistance as the piston approaches the ends of said plate.

The partition contains a multiplicity of comparatively small openingspresenting distributed fluid controlling friction surfaces resisting theegress of fluid through Said partition at widely distributed points. andas a result furnishes a very advan tageous and variable control over thepiston in its movements.

To permit the perforations to provide a comparatively large totalcentral area of opening intermediate the ends of said plate and anopening gradually reduced toward the ends of said plate. themultiplicity of comparatively small openings are distributed laterallyof said plate and graded longitudinally of the latter toward the endsthereof. llerein the pcrforations arc arranged in zones including acentral zone 1, containing comparatively large perfora` tions, zonesabove and beneath said cen-- tral zone providing a reduced total area ofopening, and end perforated zones c, c bevondl the latter zonesproviding a still greater reduced total area of opening. By thisarrangement. not only is the downward movement of the vehicle bodycushioned. but also the rebound or recoil thereof is effectivelycushioned.

The purpose of a shock absorber as applied i vehicles. is primarily toprevent any .overstrain of the springs of the vehicle such as mightoccur on almormal conditions of travel, and the effectiveness of a shookabsorber is proportional to the degree in which it is successful insupplem 'ting the springs and taking care of abnorm shocks. therebypermitting the springs to be freely responsive to absorb normal shocks.

The shock absorber described, lends itself very advantageously to thisend. For example, when the vehicle is traveling over comparativelysmooth roads, the plunger will oscillate comparatively freely withlittle re Sistance owing t0 the freedom of passage of the Huid throughthe central zone or zones, but on the occurrence of abnormal jolts, suchas would throw the plunger bevond said central Yenes, the latter meetswith greater resistance vowing to the reduced area of opening presentedby said end zone perforations. Preferably the plunger will be adjustedto lie normally somewhat-,beyond the central zone so that when thevehicle passes over obstructions, the plunger will be comparatively freeto move past a substantial' area offering little resistance oropposition to the plunger movement. On going over a severe obstruction,the plunger will move on and meet with greater resistanw tiert-fl lo!the small or fewer opening. and on the recoil from the jolt the plunger.vil nam been past the freer opening centra? 'ff-nn; *o the otherreduced area end zone, 'Yi-iis v "oro ion and prevent the vehicle body:"riao bounding sufliciently to ovens; springs and will maintain theinlaat the vehicle continuously within ib l safe .'ibratory movement of:.io' s, without passing beyond the elas" the latter. In the event laif1 g should ever be moved sutlicif'ntly 'to it, with a side of the casingand 11". render if, d

cult to start it away from saco, side #rising *o suction. there may beprovided z se sages 55 at the opposite evtrenuy otros vii .id partitionplate coiitrolled by svreiv vavcs Si? threaded in said tover piate andhaving smooth reduced ends .'il fern'. -d to tif in the 35 saidpassages. These val" ma; lic liu' adjusted to throttle said operi lessor completel)v as desired,

To adapt thc shock absorber uses as. foi example velo-cle o? 9i? lightdraft. substitute partiti' be employed havo perofati ent areas orVtreoue It will be under Lood that this siiocli do sorber is not limitedin its use to velocies, but that it ma be readil)y cuiploved for otherpurposes.

Having described one emlioifiimfrr at' the invention without limitingthe sanieceto, what l claim as new and desire to se( i2. e by mi?Letters latent is:

1. A shock absorber comprising, in coniliination, a sectoi-shaped fluidcontaining casing; and an are-like partition therein A having amultiplicity of Qtmiparatively WG small openings distributed laterallyand graded longitudinally of said partiizon to present distributed tiuidcontrolling friction surfaces; and a plonger fulcrumed in said l casingand movable against the es ance im offered to the passage of said fluidby said openings.

A shook absorber coni ising in combination. a sector shaped il.-footaiii-ing casing having a curved nail: a veci pai ition spaced fromsaid n'ali and dividingi casing into chambers, said partition having amultiplicity of graded and distributed luid-controlling holestherethrough; and mi oscillatory blade in one of said chambers forforcing the fluid from the fulcrum ond of said blade along the latterthrough the holes in said partition t0 the opposite side of said blade.

3. A shock absorber comprising in combination a sectorshapedfluids-cumming casing;y a partition removabliv mofsnted in said casingand having a multiplicity of graded and distributed ilu-ificontrollingholes extending therethrough, ed an oscill latory plunger fulcrumed insaid casing for forcing the 'fluid through the holes in said partition.

4. A shock absorber comprising in combination, a sector shapedfluid-containing casing 1; a partition 9 therein having a multiplicityof graded and distributed fluid-controlling holes extendingtherethrough; a cover plate 5; means to secure said plate to saidcasing; an oscillatory plunger 13 in said easing; and u shaft 15 forsaid plunger projecting out of said casing.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing Witnesses.

DWIGHT F. KILGOUR.

Witnesses z HENRY T. WILLIAMS, ROBERT H. KAMMLER.

